Train Your Pet Not to Scratch at the Door! This new portable wireless electronic Pet Doorbell Set helps your pets tell you when they need to come in or go out (and no more "accidents"). Works for both dogs and cats and any size pet can operate it by simply pushing the Pet Paw transmitter which works up to 100 feet away. The Pet Paw operates on one 9-volt battery (not included) and the Receiver operates on 3 AA batteries (not included). Extra paws allow you to place one inside and one outside or at several doors. Both units are made of durable plastic and the paws are weather resistant. Receiver chime can stand on a counter or be mounted on the wall. Easy step-by-step instructions are included to quickly train your pets!